The Samsung Galaxy S4 has a few secrets up its sleeve if you know how to access them. All you need to do is go to the phone keypad and type in the follow codes to access the following screens.

The first code is ‘*#1234#’. This will display the current software versions you have installed on the device. Quite frankly I have no idea what any of this means but it might be useful to someone.

The second code is ‘*#12580*369#’ and this will display the current software and hardware versions. Again, that’s just a few lines of characters and I don’t know what any of them mean.

Maybe this code might be more useful to you. It’s *#0228#’ and it displays the battery status of the phone. Now I’m sure this technical data will be useful to someone!

There is one more code to give you, but this is by far the most interesting one. It’s *#0*# and it gives you access to lots of different tests you can perform such as checking the screen colour and the speakers.

You can also test out the LED light colours which are very pretty.

You can even test the touch screen but just be aware that there’s no way to exit this screen without filling in all these white blocks into green blocks.

There’s plenty more things to play about with here and when you’re finished, press the back button twice to return to your phone number pad.

Obviously as a final disclaimer, you use these codes at your own risk. If you break your phone, it wasn’t my fault!